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EXPLANATION OF SYMBOL$ ON <br /> EXPLORATORY BORING LOGS <br /> (CONTINUED) <br /> i Ground-Water Level Column <br /> $ DEPTH TO FIRST OBSERVED GROUND WATER <br /> DEPTH TO STABILIZED GROUND WATER i <br /> miscellaneous ' <br /> Z 5 YR �/Z Color as field checked to Munsell So" Color Chart <br /> (1975 Edition) i <br /> PENETRATION Blows required to drive sampler I foot into soil. <br /> Standard drive hammer weight: 140 pounds. <br /> inches <br /> Standard drop: 30 <br /> i <br /> nI <br /> s� <br /> x•� <br /> _1 <br /> l: a <br /> j — <br />